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<h1 id="sec_name">
<span data-if="hdevelop" style="display:inline;">create_message_queue</span><span data-if="c" style="display:none;">T_create_message_queue</span><span data-if="cpp" style="display:none;">CreateMessageQueue</span><span data-if="dotnet" style="display:none;">CreateMessageQueue</span><span data-if="python" style="display:none;">create_message_queue</span> (算子名称)</h1>
<h2>名称</h2>
<p><code><span data-if="hdevelop" style="display:inline;">create_message_queue</span><span data-if="c" style="display:none;">T_create_message_queue</span><span data-if="cpp" style="display:none;">CreateMessageQueue</span><span data-if="dotnet" style="display:none;">CreateMessageQueue</span><span data-if="python" style="display:none;">create_message_queue</span></code> — Create a new empty message queue.</p>
<h2 id="sec_synopsis">参数签名</h2>
<div data-if="hdevelop" style="display:inline;">
<p>
<code><b>create_message_queue</b>( :  :  : <a href="#QueueHandle"><i>QueueHandle</i></a>)</code></p>
</div>
<div data-if="c" style="display:none;">
<p>
<code>Herror <b>T_create_message_queue</b>(Htuple* <a href="#QueueHandle"><i>QueueHandle</i></a>)</code></p>
</div>
<div data-if="cpp" style="display:none;">
<p>
<code>void <b>CreateMessageQueue</b>(HTuple* <a href="#QueueHandle"><i>QueueHandle</i></a>)</code></p>
<p>
<code>void <a href="HMessageQueue.html">HMessageQueue</a>::<b>HMessageQueue</b>()</code></p>
<p>
<code>void <a href="HMessageQueue.html">HMessageQueue</a>::<b>CreateMessageQueue</b>()</code></p>
</div>
<div data-if="com" style="display:none;"></div>
<div data-if="dotnet" style="display:none;">
<p>
<code>static void <a href="HOperatorSet.html">HOperatorSet</a>.<b>CreateMessageQueue</b>(out <a href="HTuple.html">HTuple</a> <a href="#QueueHandle"><i>queueHandle</i></a>)</code></p>
<p>
<code>public <a href="HMessageQueue.html">HMessageQueue</a>()</code></p>
<p>
<code>void <a href="HMessageQueue.html">HMessageQueue</a>.<b>CreateMessageQueue</b>()</code></p>
</div>
<div data-if="python" style="display:none;">
<p>
<code>def <b>create_message_queue</b>() -&gt; HHandle</code></p>
</div>
<h2 id="sec_description">描述</h2>
<p><code><span data-if="hdevelop" style="display:inline">create_message_queue</span><span data-if="c" style="display:none">create_message_queue</span><span data-if="cpp" style="display:none">CreateMessageQueue</span><span data-if="com" style="display:none">CreateMessageQueue</span><span data-if="dotnet" style="display:none">CreateMessageQueue</span><span data-if="python" style="display:none">create_message_queue</span></code> creates a new empty message queue.
The output parameter <a href="#QueueHandle"><i><code><span data-if="hdevelop" style="display:inline">QueueHandle</span><span data-if="c" style="display:none">QueueHandle</span><span data-if="cpp" style="display:none">QueueHandle</span><span data-if="com" style="display:none">QueueHandle</span><span data-if="dotnet" style="display:none">queueHandle</span><span data-if="python" style="display:none">queue_handle</span></code></i></a> is a handle to the newly created
message queue and is used to identify the queue in any subsequent operator
calls using the queue.
</p>
<p>The message queues are designed as FIFO pipes delivering arbitrary sets of
data safely among different threads. The queue access is internally fully
synchronized, no explicit locking is required from the application.
The data is traveling through the queue in so called messages
(see <a href="create_message.html"><code><span data-if="hdevelop" style="display:inline">create_message</span><span data-if="c" style="display:none">create_message</span><span data-if="cpp" style="display:none">CreateMessage</span><span data-if="com" style="display:none">CreateMessage</span><span data-if="dotnet" style="display:none">CreateMessage</span><span data-if="python" style="display:none">create_message</span></code></a>).
</p>
<p>Multiple producer threads can append data simultaneously
(<a href="enqueue_message.html"><code><span data-if="hdevelop" style="display:inline">enqueue_message</span><span data-if="c" style="display:none">enqueue_message</span><span data-if="cpp" style="display:none">EnqueueMessage</span><span data-if="com" style="display:none">EnqueueMessage</span><span data-if="dotnet" style="display:none">EnqueueMessage</span><span data-if="python" style="display:none">enqueue_message</span></code></a>) while multiple consumer threads are simultaneously
retrieving the data again (<a href="dequeue_message.html"><code><span data-if="hdevelop" style="display:inline">dequeue_message</span><span data-if="c" style="display:none">dequeue_message</span><span data-if="cpp" style="display:none">DequeueMessage</span><span data-if="com" style="display:none">DequeueMessage</span><span data-if="dotnet" style="display:none">DequeueMessage</span><span data-if="python" style="display:none">dequeue_message</span></code></a>). Multiple messages
can be enqueued together using a single <a href="enqueue_message.html"><code><span data-if="hdevelop" style="display:inline">enqueue_message</span><span data-if="c" style="display:none">enqueue_message</span><span data-if="cpp" style="display:none">EnqueueMessage</span><span data-if="com" style="display:none">EnqueueMessage</span><span data-if="dotnet" style="display:none">EnqueueMessage</span><span data-if="python" style="display:none">enqueue_message</span></code></a> operation.
In such case, those messages will travel together through the queue
and will be delivered through a single <a href="dequeue_message.html"><code><span data-if="hdevelop" style="display:inline">dequeue_message</span><span data-if="c" style="display:none">dequeue_message</span><span data-if="cpp" style="display:none">DequeueMessage</span><span data-if="com" style="display:none">DequeueMessage</span><span data-if="dotnet" style="display:none">DequeueMessage</span><span data-if="python" style="display:none">dequeue_message</span></code></a> call.
</p>
<p>All the enqueued messages are copied by the
<a href="enqueue_message.html"><code><span data-if="hdevelop" style="display:inline">enqueue_message</span><span data-if="c" style="display:none">enqueue_message</span><span data-if="cpp" style="display:none">EnqueueMessage</span><span data-if="com" style="display:none">EnqueueMessage</span><span data-if="dotnet" style="display:none">EnqueueMessage</span><span data-if="python" style="display:none">enqueue_message</span></code></a> operation. The original message(s) can thus be
immediately reused after the <a href="enqueue_message.html"><code><span data-if="hdevelop" style="display:inline">enqueue_message</span><span data-if="c" style="display:none">enqueue_message</span><span data-if="cpp" style="display:none">EnqueueMessage</span><span data-if="com" style="display:none">EnqueueMessage</span><span data-if="dotnet" style="display:none">EnqueueMessage</span><span data-if="python" style="display:none">enqueue_message</span></code></a> call without affecting
the enqueued copy.
</p>
<h2 id="sec_execution">运行信息</h2>
<ul>
  <li>多线程类型:可重入(与非独占操作符并行运行)。</li>
<li>多线程作用域:全局(可以从任何线程调用)。</li>
  <li>未经并行化处理。</li>
</ul>
<h2 id="sec_parameters">参数表</h2>
  <div class="par">
<div class="parhead">
<span id="QueueHandle" class="parname"><b><code><span data-if="hdevelop" style="display:inline">QueueHandle</span><span data-if="c" style="display:none">QueueHandle</span><span data-if="cpp" style="display:none">QueueHandle</span><span data-if="com" style="display:none">QueueHandle</span><span data-if="dotnet" style="display:none">queueHandle</span><span data-if="python" style="display:none">queue_handle</span></code></b> (output_control)  </span><span>message_queue <code>→</code> <span data-if="dotnet" style="display:none"><a href="HMessageQueue.html">HMessageQueue</a>, </span><span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">HHandle</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (handle)</span><span data-if="dotnet" style="display:none"> (<i>IntPtr</i>)</span><span data-if="cpp" style="display:none"> (<i>HHandle</i>)</span><span data-if="c" style="display:none"> (<i>handle</i>)</span></span>
</div>
<p class="pardesc">Handle of the newly created message queue.</p>
<p class="pardesc"><span class="parcat">Number of elements:
      </span>QueueHandle == 1</p>
<p class="pardesc"><span class="parcat">Assertion:
      </span><code>QueueHandle != 0</code></p>
</div>
<h2 id="sec_example_all">例程 (HDevelop)</h2>
<pre class="example">
create_message_queue (ProducerQueue)
create_message_queue (ResultQueue)
* ...
</pre>
<h2 id="sec_result">结果</h2>
<p>Returns <TT>2</TT> (
      <TT>H_MSG_TRUE</TT>)
     unless a resource allocation error occurs. Otherwise
an exception is raised.</p>
<h2 id="sec_successors">可能的后置算子</h2>
<p>
<code><a href="enqueue_message.html"><span data-if="hdevelop" style="display:inline">enqueue_message</span><span data-if="c" style="display:none">enqueue_message</span><span data-if="cpp" style="display:none">EnqueueMessage</span><span data-if="com" style="display:none">EnqueueMessage</span><span data-if="dotnet" style="display:none">EnqueueMessage</span><span data-if="python" style="display:none">enqueue_message</span></a></code>, 
<code><a href="dequeue_message.html"><span data-if="hdevelop" style="display:inline">dequeue_message</span><span data-if="c" style="display:none">dequeue_message</span><span data-if="cpp" style="display:none">DequeueMessage</span><span data-if="com" style="display:none">DequeueMessage</span><span data-if="dotnet" style="display:none">DequeueMessage</span><span data-if="python" style="display:none">dequeue_message</span></a></code>
</p>
<h2 id="sec_see">参考其它</h2>
<p>
<code><a href="clear_message_queue.html"><span data-if="hdevelop" style="display:inline">clear_message_queue</span><span data-if="c" style="display:none">clear_message_queue</span><span data-if="cpp" style="display:none">ClearMessageQueue</span><span data-if="com" style="display:none">ClearMessageQueue</span><span data-if="dotnet" style="display:none">ClearMessageQueue</span><span data-if="python" style="display:none">clear_message_queue</span></a></code>, 
<code><a href="enqueue_message.html"><span data-if="hdevelop" style="display:inline">enqueue_message</span><span data-if="c" style="display:none">enqueue_message</span><span data-if="cpp" style="display:none">EnqueueMessage</span><span data-if="com" style="display:none">EnqueueMessage</span><span data-if="dotnet" style="display:none">EnqueueMessage</span><span data-if="python" style="display:none">enqueue_message</span></a></code>, 
<code><a href="dequeue_message.html"><span data-if="hdevelop" style="display:inline">dequeue_message</span><span data-if="c" style="display:none">dequeue_message</span><span data-if="cpp" style="display:none">DequeueMessage</span><span data-if="com" style="display:none">DequeueMessage</span><span data-if="dotnet" style="display:none">DequeueMessage</span><span data-if="python" style="display:none">dequeue_message</span></a></code>, 
<code><a href="set_message_queue_param.html"><span data-if="hdevelop" style="display:inline">set_message_queue_param</span><span data-if="c" style="display:none">set_message_queue_param</span><span data-if="cpp" style="display:none">SetMessageQueueParam</span><span data-if="com" style="display:none">SetMessageQueueParam</span><span data-if="dotnet" style="display:none">SetMessageQueueParam</span><span data-if="python" style="display:none">set_message_queue_param</span></a></code>, 
<code><a href="get_message_queue_param.html"><span data-if="hdevelop" style="display:inline">get_message_queue_param</span><span data-if="c" style="display:none">get_message_queue_param</span><span data-if="cpp" style="display:none">GetMessageQueueParam</span><span data-if="com" style="display:none">GetMessageQueueParam</span><span data-if="dotnet" style="display:none">GetMessageQueueParam</span><span data-if="python" style="display:none">get_message_queue_param</span></a></code>, 
<code><a href="create_message.html"><span data-if="hdevelop" style="display:inline">create_message</span><span data-if="c" style="display:none">create_message</span><span data-if="cpp" style="display:none">CreateMessage</span><span data-if="com" style="display:none">CreateMessage</span><span data-if="dotnet" style="display:none">CreateMessage</span><span data-if="python" style="display:none">create_message</span></a></code>, 
<code><a href="clear_message.html"><span data-if="hdevelop" style="display:inline">clear_message</span><span data-if="c" style="display:none">clear_message</span><span data-if="cpp" style="display:none">ClearMessage</span><span data-if="com" style="display:none">ClearMessage</span><span data-if="dotnet" style="display:none">ClearMessage</span><span data-if="python" style="display:none">clear_message</span></a></code>, 
<code><a href="set_message_tuple.html"><span data-if="hdevelop" style="display:inline">set_message_tuple</span><span data-if="c" style="display:none">set_message_tuple</span><span data-if="cpp" style="display:none">SetMessageTuple</span><span data-if="com" style="display:none">SetMessageTuple</span><span data-if="dotnet" style="display:none">SetMessageTuple</span><span data-if="python" style="display:none">set_message_tuple</span></a></code>, 
<code><a href="get_message_tuple.html"><span data-if="hdevelop" style="display:inline">get_message_tuple</span><span data-if="c" style="display:none">get_message_tuple</span><span data-if="cpp" style="display:none">GetMessageTuple</span><span data-if="com" style="display:none">GetMessageTuple</span><span data-if="dotnet" style="display:none">GetMessageTuple</span><span data-if="python" style="display:none">get_message_tuple</span></a></code>, 
<code><a href="set_message_obj.html"><span data-if="hdevelop" style="display:inline">set_message_obj</span><span data-if="c" style="display:none">set_message_obj</span><span data-if="cpp" style="display:none">SetMessageObj</span><span data-if="com" style="display:none">SetMessageObj</span><span data-if="dotnet" style="display:none">SetMessageObj</span><span data-if="python" style="display:none">set_message_obj</span></a></code>, 
<code><a href="get_message_obj.html"><span data-if="hdevelop" style="display:inline">get_message_obj</span><span data-if="c" style="display:none">get_message_obj</span><span data-if="cpp" style="display:none">GetMessageObj</span><span data-if="com" style="display:none">GetMessageObj</span><span data-if="dotnet" style="display:none">GetMessageObj</span><span data-if="python" style="display:none">get_message_obj</span></a></code>
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Foundation</p>
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